From f88c480dac88a754f84e943cb5539d59cda3c089 Mon Sep 17 00:00:00 2001 From: sonic zhang Date: Tue, 27 Nov 2007 12:47:39 +0800 Subject: [PATCH] Set proper ATA UDMA mode for bf548 according to system clock. UDMA Mode - Frequency compatibility UDMA5 - 100 MB/s - SCLK = 133 MHz UDMA4 - 66 MB/s - SCLK >= 80 MHz UDMA3 - 44.4 MB/s - SCLK >= 50 MHz UDMA2 - 33 MB/s - SCLK >= 40 MHz Signed-off-by: Sonic Zhang Signed-off-by: Jeff Garzik --- drivers/ata/pata_bf54x.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/ata/pata_bf54x.c b/drivers/ata/pata_bf54x.c index 81db405a5445..088a41f4e656 100644 --- a/drivers/ata/pata_bf54x.c +++ b/drivers/ata/pata_bf54x.c @@ -1489,6 +1489,8 @@ static int __devinit bfin_atapi_probe(struct platform_device *pdev) int board_idx = 0; struct resource *res; struct ata_host *host; + unsigned int fsclk = get_sclk(); + int udma_mode = 5; const struct ata_port_info *ppi[] = { &bfin_port_info[board_idx], NULL }; @@ -1507,6 +1509,11 @@ static int __devinit bfin_atapi_probe(struct platform_device *pdev) if (res == NULL) return -EINVAL; + while (bfin_port_info[board_idx].udma_mask>0 && udma_fsclk[udma_mode] > fsclk) { + udma_mode--; + bfin_port_info[board_idx].udma_mask >>= 1; + } + /* * Now that that's out of the way, wire up the port.. */